The viral challenge aims to raise money and awareness for the ALS Association, which supports sufferers of the motor neurone disease Lou Gerhig's. Over $15 million has been raised so far.

Completing the challenge allows you to nominate three others, with Spencer naming Sony's Shuhei Yoshida, Nintendo's Reggie Fils-Aime and Valve's Gabe Newell. The trio have just 24 hours to accept the challenge.